netdev - Re: IRQF_SAMPLE_RANDOM question...

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49DB0E7D.2070300@goop.org>
Date:	Tue, 07 Apr 2009 01:27:41 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	Robin Getz <rgetz@...ckfin.uclinux.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chris Peterson <cpeterso@...terso.com>,
	Matt Mackall <mpm@...enic.com>,
	David Miller <davem@...emloft.net>
Subject: Re: IRQF_SAMPLE_RANDOM question...

Jeff Garzik wrote:
> Stephen Hemminger wrote:
>> The real problem one is xen-netfront. Because 1) it is least random,
>> the attacker might be another VM 2) the VM is most in need of random
>> samples because it doesn't have real hardware.
>
> Agreed.
>
> I'm surprised Xen doesn't use virtio-rng.  I guess it needs a special 
> Xen paravirt driver for randomness. 

Yes, sampling randomness in a PV driver is pretty pointless.  We could 
do the guest end of an entropy sink entirely in usermode, but at present 
there's no dom0 support for an entropy source.

    J
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html